Exercise device



FIG. 1 is a perspective view of our new design;

FIG. 2 is top view thereof;

FIG. 3 is a right side view of the design of FIG. 1, the left side view being a mirror image thereof;

FIG. 4 is the rear view thereof;

FIG. 5 is the front view thereof; and,

FIG. 6 is the bottom view of our new design.

The casters shown in dashed lines in FIGS. 1, 3, 4, 5 and 6 are for illustrative purposes only and form no part of our design. 

The ornamental design for an exercise device, as shown and described. 